Journal article
Structural controls on cobalt mineralisation during regional metamorphism: an example from the Rajapalot area, Finland
- Abstract:
- The Rajapalot area of Finnish Lapland hosts an unusually high-grade association of cobalt-only and gold–cobalt deposits (10.91 Mt @ 2.5 g/t Au + 0.044% Co total inferred resources) within multiply folded metasedimentary rocks of the Paleoproterozoic Svecofennian collisional orogeny. Through the integration of X-ray computed micro-tomography and micro-X-ray fluorescence raster imaging of drill-core samples, we produce a model of cobalt-bearing ore mineralisation, which reveals primary fluid transportation mechanisms and precipitation pathways. When combined with the deposit-scale, high-resolution ground-based magnetic geophysical data, we show that cobalt-bearing ores in the Rajapalot region occur mostly as saddle reefs located in dilated fold hinges, which formed by simultaneous synthetic and antithetic shearing along developing crenulation-cleavage planes and incompetent bedding layers, respectively. We suggest that multi-layered rock complexes with alternations of competent and incompetent layers deformed and metamorphosed to upper greenschist-lower amphibolite facies should represent focus regions for cobalt exploration targeting campaigns in orogenic belts. The non-destructive workflow presented in this study could be an integral part of an early stage of cobalt mineral processing and traceability before metallurgical treatment.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Publisher copy:
- 10.1007/s00126-024-01315-x
Authors
- Publisher:
- Springer Nature
- Journal:
- Mineralium Deposita More from this journal
- Volume:
- 60
- Issue:
- 1
- Pages:
- 213–231
- Publication date:
- 2024-09-16
- Acceptance date:
- 2024-09-04
- DOI:
- EISSN:
-
1432-1866
- ISSN:
-
0026-4598
- Language:
-
English
- Pubs id:
-
2031674
- Local pid:
-
pubs:2031674
- Deposit date:
-
2024-11-29
Terms of use
- Copyright holder:
- Sayab et al
- Copyright date:
- 2024
- Rights statement:
- © The Author(s) 2024, corrected publication 2024. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
- Notes:
- A correction to this article is available online from Springer Nature at: https://dx.doi.org/10.1007/s00126-024-01330-y
- Licence:
- CC Attribution (CC BY)
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